<!DOCTYPE html>

<html>
    <head>
        <meta charset="utf-8">

    </head>
    <body>
        <script>
            function demo0(){
                
            }
            async function demo1(){
                return new Promise((resolve)=>{
                    resolve("hello")
                })
            }
            async function demo2(){
                console.log("world")
            }
            let a = demo1()
            console.log(a)
            demo2()
        </script>
    </body>
</html>